Mayor de Blasio hopes he’s finally found an animal policy the public will cheer.

In this week’s “City Hall on Staten Island” stunt, he chest-puffed about his deer-neutering policy — touting a drop in deer-related car crashes around the island as a direct result of the city’s work, which presumably has . . . cut off the growth of the population.

see also

“Maybe the deer are not happy about our particular strategic approach,” he said. Ha-ha.

The mayor also managed to oversell it, claiming an 89 percent drop in deer-related car crashes, year over year. City Hall later noted that it’s only been 31 percent, from 16 in the first quarter of 2016 to 11 this year.

The $2 million Parks Department initiative that’s neutered 820 white-tailed males is “an example of where some of these policies are really working for Staten Island,” says the mayor.

We doubt the beasts that lost their family jewels would agree — but they’re free to commiserate with the carriage horses and the groundhog heirs of Staten Island Charlotte.